Tap Remove Balls

This puzzle game is based on the Mathematical Strategy.
In this game, several balls will be arranged in a number of rows. You need to collect the last ball to win the game. Given that, you can remove as many balls you want from a row at a time. You and the computer will take turns at removing the balls.
You can alter the number of rows you want to play with, difficulty increases drastically with increase in the number of rows.